遠藤 琴音

Daisuke's wife, Achi and Suzune's mother, and the childhood friend of Kyozo Tateno.

17 years ago, soon after giving birth to Suzune, she was killed by a drug-addict, whom Tateno was unable to stop. Daisuke and Tateno note several times that Suzune is growing up to look just like Kotone, but lament Suzune's terminal heart condition will kill her young as well.